consider TVar to be a side-effect

optimizer.ml

@@ -35,9 +35,9 @@ let has_side_effect e =
 		| TConst _ | TLocal _ | TTypeExpr _ | TFunction _ -> ()
 		| TCall ({ eexpr = TField(_,FStatic({ cl_path = ([],"Std") },{ cf_name = "string" })) },args) -> Type.iter loop e
 		| TNew _ | TCall _ | TBinop ((OpAssignOp _ | OpAssign),_,_) | TUnop ((Increment|Decrement),_,_) -> raise Exit
-		| TReturn _ | TBreak | TContinue | TThrow _ | TCast (_,Some _) -> raise Exit
+		| TReturn _ | TBreak | TContinue | TThrow _ | TCast (_,Some _) | TVar _ -> raise Exit
 		| TArray _ | TEnumParameter _ | TCast (_,None) | TBinop _ | TUnop _ | TParenthesis _ | TMeta _ | TWhile _ | TFor _
-		| TField _ | TIf _ | TTry _ | TSwitch _ | TArrayDecl _ | TVar _ | TBlock _ | TObjectDecl _ -> Type.iter loop e
+		| TField _ | TIf _ | TTry _ | TSwitch _ | TArrayDecl _ | TBlock _ | TObjectDecl _ -> Type.iter loop e
 	in
 	try
 		loop e; false